Cant-centering device for twin-saw mills.



A, MEREEN & A. E. GAGNUN.

CANT (ENTERING DEVICE FOR TWIN SAW MILLS.

APPLIOATION'FILED NOV. 20, 1905. RENEWED MAY 16, 1907.

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CANT OENTERING DEVICE FOR TWIN SAW MILLS.

APPLICATION FILED NOV. 20, 1905. RENEWED MAY 16, 1907.

v .9Q2,5 ()2 Patented 0ct.27, 1908.

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A. MEREEN & A. E. GAGNON. CANT GENTERING DEVICE FOR TWIN SAW MILLS. APPLICATION FILED NOV.20,;1905. RENEWED MAY 10, 1907.

- 902,502. Patented Oct. 27, 1908.

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Specification of Letters Patent.

Eatented Oct. 27, race.

Application filed November 20, 1965, Qerial No. 388,258. Renewed may '18, WW. fierial No. 378,978.

To all whom it may concern:

Be it known that we, ARNO Manner: and ANDREW E. (horrors, of Minneapolis, Henne in county,'Minnesota, have invented certam new and useful Improvements in Cant- Centering Devices for Twin-Saw Mills, of which the following is a specification.

Our invention relates to means for feeding cants, or the logs from which a slab has been removed on each side, to the saws, and particularly to means for centering the cant with re set to the feed to insure a uniform cut by t e saws.

The obiect of our invention is to rovide means whereby a cant can be eas1 y and quickly centered while moving toward the saws without delaying the sewing operation.

A further object is to provide an a aratus whereby the cants, after being passe t rou h the saws once, can be carried around to t e feedifm and centering vdevices and put throng a second time.

The invention consists generally in means for centering the cant on the feed rolls or chains before it reaches the saws.

Further, the invention consists in various constructions and combinations, all as here inaiter described and particularly pointed out in the claims.

in the accompanying drawings forming part of this specification, Figure l is a plan view of a twin band saw mill and the feeding and centering devices provided in connection there- Fig. 2 is a side elevation partially in section of the same. Fig. 3 is a plan view of the centering devices showing the difi'erent positions in which. the may be adjusted. Fig. 4 is a detail view showing the connection between the centering rail and the operating means therefor. Fig. 5 is a sectional view on the line s-a: of Fig. 4. Figsqfi, 7 8 are detail views showing means for attaching the centeringdeviceopere -rods to their connections at each end.

in the drawings, 2 represents a twin hand saw mill having usual toothed iced soils 3 and. i front the of saws operated rroin cha se 5 and int g"- i p 3' 0 e1 to a ClPVIZlg shaft 7. elect: 3 13 pro c haw by the chains 9. In front of the band saws and on each end of the feed rolls 3, we provide centering rails 13 resting upon cross bars 14, which are sup orted on longitudinal timbers l5. Feed r'ol s '16 are provided at intervals between the rails 13 and geared to the shafts 17, which are driven from chain belts 18. Upon each end of the cross bars 14 we provide plates 19 adjustable lengthwise of said bars between lugs 20 thereon by means of set-screws 21, said lates bein normally secured to their cross ars by bolts 22 which pass through slots in said lates. By the adjustment of these lates t e travel of the centeri bars towar or from each other can be regu ated. Upon the plates 19 upright studs 23 are mounted having reduced upper ends 24 which fit within guideways 25 provided in brackets 26 that are securely olted to the'outside of the rails 13, there being preferably two pair of these brackets one at the front end of the rails and the other near the rear ends thereof, though others may be employed if preferred, and the uideways are arranged in their brackets obilqueiy with respect to the rails whereto the brackets are secured.

The guideways are of suiiicient length to allow the required range of movement of the centering rails and permit them to be separated a suihcient distance to receive cents of large size between them or moved toward one another to center a small cant, as indicated by dotted lines in Fi 3. The position of the guideways in. their brackets cause the centering raiis to have a combined iengthwise and transverse movemen and to oper ate them simultaneously dining the operation of centering a cant on the feed rolls we provide a cylinder 27 arranged preferably beneath the door 28 and having its piston rod 29 connected by iinli: with an upright lever 3'1 pivot a post intermediate to its ends and pro *ough the said iioor and av' which r on i provident in this rocker wn rods inserted and se Each centering ein the ends red by a) back and forth without any cramping or binding of the connections between them and the .lever 31. The cylinder valve 39 is connected to a rod 40 which is 0 erated by a lever 41 within convenient reach of the attendant. Levers 42 and 43 control the saws and the operation of the feed rolls. When the cants pass from the deck 8 upon the feed rolls between the centering rails, the operator will move the lever 41 and draw the centering rails toward one another and center the cant on the rolls, then separate the centering rails andallow the cant to be moved forward until it isengaged by the toothed feed rolls 3. At this point a toothed wheel 44 mounted in the lower end of an arm 45 engages the top of the cant and holds it firmly on the feed rolls. The arm 45-is pivoted at 46 and the wheel 44 is preferably driven through a sprocket chain connection 47 with a shaft 48, which in turn is driven through a chain 49 from the feed roll shaft 5.

After the cant is engaged by the toothed feed rolls it may be centered again before reaching the saws by means of the centering bars. These bars move in unison with one another, and have the same travel and are properly adjusted with respect to the saws, so that when the cant is delivered between them and clamped by the rails it will be centered with respect to the feed and properly alined with the cutting edges of the saws, and a uniform cut will be made on each side of the cant. All this is done very rapidly and much faster than is possible with the means heretofore emlployed for this purpose.

will be noted that the inclination of the guideways is toward the saws or in the direction of travel of the cants, and consequently if the rails remain in their clamped position too long after the cant engages the feed rolls, the strain or pull of the rolls on the cant will have the efiect of drawing the rails toward the saws and separatin them sufficiently to allow the cant to trave freely. The proper adjustment of the studs 23 in their guideways to regulate the travel of the centering rails is obtained by movin back and forth, and when this adjustment is once obtained further movement of these plates will be unnecessary during the operation of the apparatus, unless some special occasion arises for a re-adjustment.

0n the discharge side of the saws a wa 50 is provided having driven rolls 51, to w ich the cants are delivered from the feed rolls 4 and side deliver chains 52 operating overa deck 53 from w -ich the cants after passing once through the saws are delivered to a re turn way 54, having a series of driven rolls 55, on which the cants are returned to a deck 56 with transversely operatin chains 57 driven from a chain belt 58 an located on the side of the centering rails op osite from the deck 8, the starting point 0 the cants.

the plates 19 eoasos By means of this apparatus a cant can be delivered to the centering rails and feed rolls on one side and moved past the saws and a board taken off on each side and then returned to the feed rolls and centering rails on the other side, and the operation repeated.

In place of the feed rolls operating be tween the centering rails, a chain might be substituted which we have thought unneoessary to illustrate, as its use in place of the rolls and as a full equivalent therefor is fully understood. Furthermore, we do not wish to be confined to the articular means employed for operating t e centering rails and imparting the combined lengthwise and lat- 2. The combination of a saw, means for positively feeding a cant thereto, longitudinally and laterally movable centering rails to center a cant on the feeding means, positively actuated means for moving said rails forward and backward, and means for spreading the rails to and from each other in their forward and backward movements.

3. The combination with a saw, of means for feeding the cants thereto, centering rails having a combined lateral and longitudinal movement to center the cants upon said feeding means, said rails in centering the cant havin a movement in theppposite direction to t e travel of the cant to the saw, and means for primarily shifting the rails longitudinally to s read them apart or draw means for feeding a cant between them, rails I operating upon each side of said feeding means to center the cant thereon, said rails having a combined lengthwise and lateral movement, means for uiding said rails laterally in their 1011 itu inal movement, and positively actuated means for moving said rails forward and backward, substantially as described.

6. The combination with twin saws, of means for feeding a cant between them, centering rails providedon each side'of said feeding means, power. actuated mechanism within control of the o rator. for moving said centering rails towar one another simultaneously to centerthe can't on said feeding means, and means-for spreadiugsaid rails apartinm'ovement ofthe railsftowardthe saw. v

7. The *combination'with twin saws, of means for feeding a cant between them,,centering. rails, brackets having guideways thereon obliquely arranged with respect to the direction of movement of said feeding' means, studs fitting within said guideways andwhereon saidv rails and brackets have a combined lengthwise and lateral movement, and mechanism for operating-said rails.

8. The combination =with twin saws, I of .feeding means therefor, centering rails,

brackets mounted thereon and having obliquely arranged guideways, plates having studs fitting within said gmdeways, and means'for adjusting said plates transversely with respect to said centering rails. y I

9. The combination with a deck having means for moving ;a eantwthereon, ,o'ftwin" saws, fee meansdocated between said saws and d'ec and arrange from said. deck andl'feed it between said saws, a discharge way havingidriven rollsj a'rranged on the delivery side-of; said'saws, a return way having driven rolls, a conveyer' arranged to receive thef cantsfrom'jsaidsc'lischarge way and deliver them to said return J way, a second log deck arranged -near the' d to receive a cant v end of said return way havinga cant-moving means thereon arranged to return the cant to-said feeding" means, I

cant-centering devices operating in connection withsaid feeding means, substantially asdescnbed.

U I 10'; The combination, with twin saws, of

feeding means located between said saws, a discharge way having driven rolls arranged on the delivery side of said saws, a'retur'n .way having driven rells, a'conveyer arranged to receive the cants from said discharge we and deliver them to said return wa a dec arranged near the discharge end 0 said return way and having a cant moving means thereon arranged to deliver thecant to said feeding means, and cente devices operatin connection with sai feeding means, su stantially as described.

1 In witness whereof, we have hereunto set our hands ARNo MEREEN, at Chicago, Cook Coxlllinois, this 18th day of November 1905, I and ANDREW E. GAGNON, at Minneapolis,

this 15th day of November, 1905. 7 ARNOMEREEN.

ANDREW E. GAQNON.

' Witnesses "to Arno Mereen:

H. D. Pn'rrmoNE,

HMO. Prnnon;

Witnesses-to Andrew E. Gagnon:

Rfrcnsnn PAUL, M. Scor'r- 

